JP7455360B2 - Pump device and shaft seal device - Google Patents

Description

The present invention relates to a pump device and a shaft sealing device.

A shaft sealing device is known to have a fixed ring fixed to an object to be sealed and a rotating ring fixed to a rotating shaft, and a sliding surface is formed between the fixed ring and the rotating ring. ing. Such a shaft sealing device is, for example, provided with a fixed ring, a rotating ring, and a shaft sealing chamber that accommodates a lubricant, and the sliding surface is lubricated and cooled by the lubricant stored in the shaft sealing chamber (for example, as disclosed in Patent Document (see 1). A shaft sealing device is used, for example, in a pump device, and seals a gap between a rotating shaft and a pump casing.

In addition, in a pump device in which the rotating shaft is provided along the direction of gravity, the shaft sealing chamber is generally not filled with lubricant, but contains lubricant in an amount of about 80% of the volume of the shaft sealing chamber. . This is because an air pocket is provided above the shaft sealing chamber in advance in anticipation of the expansion rate of the lubricant as the pump device is driven.

Japanese Patent Application Publication No. 2009-210009

However, if the sliding surface is located above the liquid level of the lubricant contained in the shaft sealing chamber, the lubricant will not be supplied to the sliding surface, and the lubrication and cooling functions of the sliding surface may be impaired. was there.

Therefore, an object of the present invention is to provide a pump device and a shaft seal device that can stably supply lubricant to a sliding surface located above the liquid level of the lubricant.

According to one aspect of the present invention, the pump device includes a rotating shaft provided along the direction of gravity, a motor provided above the rotating shaft to rotate the rotating shaft, and a motor provided below the rotating shaft. , a pump having a pump casing and driven by rotation of the rotating shaft; a shaft sealed chamber provided between the motor and the pump, formed by at least the pump casing and through which the rotating shaft passes; and the shaft; It has a fixed ring disposed inside the sealed chamber and above the shaft sealed chamber, a rotating ring that slides on the fixed ring, and a spring that urges the rotating ring toward the fixed ring. a shaft sealing member, a lubricant that is stored in the shaft sealing chamber in an amount to form a liquid level below the fixed ring, and an inner circumferential surface of which forms a gap with the spring and an upper end of which is the ceiling of the shaft sealing chamber. a cylindrical portion that is spaced apart from a surface and covers the periphery of the spring and at least a portion of the rotating ring; an opening provided on the lower end side of the cylindrical portion; , and has a wall portion that is integrally provided with the open end of the opening portion on the primary side in the rotational direction of the rotation shaft, and that faces at least a portion of the opening portion in the radial direction of the cylindrical portion. a guide member , and the spring has a winding direction from the bottom to the top that is the same as the rotation direction of the rotation shaft .

According to one aspect of the present invention, the shaft sealing device includes a shaft sealing chamber provided along the direction of gravity and through which the rotating shaft passes, and a shaft sealing device disposed inside the shaft sealing chamber and above the shaft sealing chamber. a shaft sealing member having a fixed ring, a rotating ring that slides with respect to the fixed ring, and a spring that biases the rotating ring toward the fixed ring; a lubricant contained in an amount to form a liquid level, an inner peripheral surface forming a gap with the spring, and an upper end spaced apart from the ceiling surface of the shaft sealing chamber to surround the spring and at least a portion of the rotating ring; a cylindrical part that covers the periphery of the cylindrical part, an opening provided on the lower end side of the cylindrical part, and an opening provided on the inner circumferential surface side of the cylindrical part and in the rotational direction of the rotating shaft among the open ends of the opening part. a guide member that is integrally provided at the opening end on the primary side and has a wall portion facing at least a portion of the opening portion in the radial direction of the cylindrical portion , and the spring is wound upwardly from below. The direction is the same as the rotation direction of the rotation shaft .

According to the present invention, it is possible to provide a pump device and a shaft seal device that can stably supply lubricant to a sliding surface located above the liquid level of the lubricant.

FIG. 1 is a partially cross-sectional front view showing the configuration of a pump device according to an embodiment of the present invention. FIG. 3 is a top view showing the configuration of main parts of the pump device. FIG. 2 is a front view partially showing the configuration of the main parts of the pump device in cross section. FIG. 3 is a bottom view showing the configuration of a guide member used in the pump device. FIG. 5 is a cross-sectional view conceptually showing the configuration of the guide member taken along the line VV in FIG. 4; FIG. 7 is a bottom view showing another example of the configuration of the guide member. FIG. 7 is a bottom view showing another example of the configuration of the guide member.

EMBODIMENT OF THE INVENTION Hereinafter, the pump apparatus 1 based on one Embodiment of this invention is demonstrated using FIG. 1 thru|or FIG. 5. FIG. 1 is a front view partially showing the configuration of the pump device 1 in cross section. FIG. 2 is a top view conceptually showing the structure of the shaft sealing device 14 as the main structure of the pump device 1, and FIG. 3 is a top view conceptually showing the structure of the shaft sealing device 14 as the main structure of the pump device 1. It is a front view shown in a partial cross section. Further, FIG. 4 is a bottom view showing the configuration of the guide member 53 used in the shaft sealing device 14 of the pump device 1, and FIG. FIG.

As shown in FIG. 1, the pump device 1 includes a rotating shaft 11, a motor 12, a pump 13, and a shaft sealing device 14. The pump device 1 is, for example, a so-called submersible drainage pump that is installed in sewage and pumps the sewage to the secondary side.

The rotation axis 11 is provided along the direction of gravity. Hereinafter, two directions along the direction of gravity will be described as up and down directions. The rotating shaft 11 is rotated by the motor 12 to drive the pump 13 .

The motor 12 is provided above the rotating shaft 11 . The motor 12 includes a motor casing 21, a rotor housed in the motor casing 21, and a stator that rotates the rotor. The rotor is connected to a rotating shaft 11. The motor 12 rotates the rotating shaft 11 by rotating a rotor. In the motor 12 , the lower surface of the motor casing 21 constitutes a part of the shaft sealing chamber 51 in the shaft sealing device 14 .

The motor casing 21 has an opening on the lower surface through which the rotating shaft 11 passes. The lower surface of the motor casing 21 constitutes a part of the shaft sealing chamber 51 in the shaft sealing device 14 .

The pump 13 includes an impeller 31, a pump casing 32, a discharge flange 33, and a strainer 34. The pump 13 is configured to be able to discharge fluid whose pressure increases as the rotating shaft 11 rotates to the secondary side. The pump 13 is, for example, a vortex type pump that has excellent foreign matter permeability.

The impeller 31 is fixed to the rotating shaft 11 and rotates as the rotating shaft 11 rotates. The impeller 31 is fixed to the lower end of the rotating shaft 11, for example. The impeller 31 increases the pressure of the fluid within the pump casing 32 as the rotating shaft 11 rotates.

The pump casing 32 has the impeller 31 disposed therein, and is configured to be able to increase the pressure of the water inside as the impeller 31 rotates. The pump casing 32 includes a first casing 41, a second casing 42, and a casing cover 43. The pump casing 32 is configured by laminating a first casing 41, a second casing 42, and a casing cover 43 in the axial direction of the rotating shaft 11. In addition, as shown by the dashed-two dotted line in FIG. 1, the 1st casing 41, the 2nd casing 42, and the casing cover 43 are mutually connected using the 1st fastening member 200, such as a bolt.

The first casing 41 constitutes the lower stage of the pump casing 32. The first casing 41 has a suction port 41a and a leg portion 41b. The suction port 41a is an opening formed coaxially with the rotating shaft 11. The suction port 41a is configured to be able to suck raw water into the pump casing 32. The leg portion 41b is provided on the lower surface of the first casing 41 and placed on the installation surface. The leg portions 41b create a gap between the installation surface and the suction port 41a through which raw water can flow into the suction port 41a and in which the strainer 34 can be placed.

The second casing 42 is fixed to the upper surface of the first casing 41 and constitutes the middle stage of the pump casing 32. The second casing 42 includes a housing portion 42a, a discharge port 42b, and a seal portion 42c. The accommodating portion 42a is configured to be able to accommodate the impeller 31. Further, the housing portion 42a is configured such that the impeller 31 can be placed at a position facing the suction port 41a of the first casing 41. The discharge port 42b is an opening that is provided outward in the horizontal direction with respect to the housing portion 42a and continues upward. The seal portion 42c is provided near the discharge port 42b and provides a watertight seal between the second casing 42 and the discharge flange 33.

The casing cover 43 is fixed to the upper surface of the second casing 42 and constitutes the upper stage of the pump casing 32. The casing cover 43 covers the upper part of the housing part 42a of the second casing 42. Further, a portion on the outer circumferential side of the lower surface of the motor casing 21 is placed in contact with a portion on the outer circumferential side of the upper surface of the casing cover 43 . The upper surface of the casing cover 43 constitutes the other part of the shaft sealing chamber 51 in the shaft sealing device 14 . The casing cover 43 has, for example, an opening 43a, a seal portion 43b, a cap hole 43c, and a cap 43d.

The opening 43a is formed into a circular shape having an inner diameter through which the rotating shaft 11 can pass, and through which an upper fixing ring 61 (described later) of the shaft sealing device 14 can be placed along the opening edge.

The seal portion 43b is provided on the contact surface of the casing cover 43 with the second casing 42, and provides a watertight seal between the casing cover 43 and the second casing 42.

The cap hole 43c is configured such that the lubricant 100 can be injected into the shaft sealing chamber 51. The cap hole 43c is a hole that penetrates into the shaft sealing chamber 51 from the outer surface of the casing cover 43. For example, the cap hole 43c continues horizontally from the outer peripheral surface to the inner peripheral surface of the casing cover 43.

The cap 43d is removably inserted into the cap hole 43c and closes the cap hole 43c. Note that the cap 43d includes a seal portion 43e that seals between the cap hole 43c and the cap hole 43c when the cap 43d is inserted into the cap hole 43c.

The discharge flange 33 is a flange that is fluidly continuous with the discharge port 42b of the second casing 42 and constitutes a part of the flow path on the secondary side of the pump 13. As shown by the two-dot chain line in FIG. 1, the discharge flange 33 is fixed to the second casing 42 using, for example, a second fastening member 300 such as a bolt and a nut.

The strainer 34 is fixed to a part of the outer surface of the pump casing 32 and covers the suction port 41a. The strainer 34 removes some of the foreign matter contained in the wastewater when the wastewater flows into the pump casing 32 from the suction port 41a.

As shown in FIGS. 1 to 3, the shaft sealing device 14 includes a shaft sealing chamber 51, a lubricant 100, a shaft sealing member 52, and a guide member 53. In addition, in FIG. 2, the structure of the shaft sealing member 52 is omitted. The shaft sealing device 14 is configured to be able to prevent water from flowing upward from the pump casing 32. The shaft sealing device 14 also prevents the lubricant 100 housed in the shaft sealing chamber 51 and lubricating the shaft sealing member 52 from flowing out above the shaft sealing chamber 51, in other words, flowing into the motor casing 21. be configured to prevent this.

The shaft sealing chamber 51 has a bottom surface and a ceiling surface, and forms an internal space through which the rotating shaft 11 can pass and which can accommodate the lubricant 100. The shaft sealing chamber 51 is configured by, for example, an upper part of the casing cover 43 and a lower part of the motor casing 21. The internal space of the shaft sealing chamber 51 is, for example, a space surrounded by the upper surface of the casing cover 43 and the lower surface of the motor casing 21. In this embodiment, the upper surface of the casing cover 43 constitutes the bottom surface of the shaft sealing chamber 51, and the lower surface of the motor casing 21 constitutes the ceiling surface of the shaft sealing chamber 51.

Here, the lubricant 100 is, for example, lubricating oil. The lubricant 100 is stored in the shaft sealing chamber 51 in an amount that does not exceed the volume of the shaft sealing chamber 51 even due to thermal expansion while the pump 13 is being driven. As a specific example, the lubricant 100 is accommodated in the shaft sealing chamber 51 in a volume that is approximately 80% of the volume of the shaft sealing chamber 51 . That is, inside the shaft sealing chamber 51, a liquid surface 100a of the lubricant 100 is formed at least at a position spaced apart from the ceiling surface of the shaft sealing chamber 51.

As shown in FIG. 3, the shaft sealing chamber 51 has an upper opening 51a, an upper inner wall 51b, a lower opening 51c, a lower inner wall 51d, and an engaging portion 51e. In this embodiment, the upper inner wall portion 51b is configured by the lower surface of the motor casing 21, and the lower inner wall portion 51d and the engaging portion 51e are configured by the upper surface of the casing cover 43.

The upper opening 51a is provided on the ceiling surface of the shaft-sealed chamber 51, and is formed so that the rotating shaft 11 can pass therethrough.

The upper inner wall portion 51b is provided around the upper opening portion 51a and has a cylindrical shape that projects downward. The upper inner wall portion 51b is configured such that an upper fixing ring 61 of the shaft sealing member 52, which will be described later, can be placed inside. The upper inner wall portion 51b constitutes a housing for the upper fixed ring 61.

The lower opening 51c is provided on the bottom surface of the shaft sealing chamber 51, and is formed so that the rotating shaft 11 can pass therethrough. In this embodiment, since the casing cover 43 constitutes the bottom surface of the shaft sealing chamber 51, the lower opening 51c is the opening 43a of the casing cover 43.

The lower inner wall portion 51d is provided around the lower opening portion 51c and has a cylindrical shape that projects upward. The lower inner wall portion 51d is configured such that a lower fixing ring 63 of the shaft sealing member 52, which will be described later, can be placed inside. The lower inner wall portion 51d constitutes a housing of the lower fixed ring 63.

The engaging portion 51e is configured to be able to engage with an engaged portion 81c provided on the guide member 53. The engaging portion 51e is, for example, a protrusion that is provided on a part of the outer peripheral surface of the lower inner wall portion 51d and protrudes in the radial direction. For example, a plurality of engaging portions 51e are provided at equal intervals in the circumferential direction of the lower inner wall portion 51d. As a specific example, the engaging portions 51e are provided at three locations.

The shaft sealing member 52 is a mechanical seal that seals between the rotating shaft 11 and the upper opening 51 a of the shaft sealing chamber 51 and between the rotating shaft 11 and the lower opening 51 c of the shaft sealing chamber 51 . The shaft sealing member 52 prevents, for example, the lubricant 100 from flowing out from the shaft sealing chamber 51 into the motor casing 21, and also prevents water from flowing into the shaft sealing chamber 51 from the pump casing 32. The shaft sealing member 52 includes an upper fixed ring 61, an upper rotating ring 62, a lower fixed ring 63, a lower rotating ring 64, and a spring 65.

The upper fixed ring 61 is formed in an annular shape through which the rotating shaft 11 passes. The upper fixing ring 61 is disposed inside the upper inner wall portion 51b of the shaft sealing chamber 51 along the opening edge of the upper opening 51a, and is fixed to the ceiling surface of the shaft sealing chamber 51. In this embodiment, the upper fixed ring 61 is arranged around the opening edge of the motor casing 21 and fixed to the lower surface of the motor casing 21. Note that the upper fixed ring 61 is located above the liquid level 100a of the lubricant 100.

The upper rotating ring 62 is formed in an annular shape along the outer peripheral surface of the rotating shaft 11 . The upper rotating ring 62 is configured to be rotatable together with the rotating shaft 11 and movable in the axial direction with respect to the rotating shaft 11. The upper surface of the upper rotating ring 62 faces the upper fixed ring 61. Further, the other end of the spring 65 is fixed to the lower surface of the upper rotating ring 62. The upper rotating ring 62 forms a sliding surface with the upper fixed ring 61.

The lower fixed ring 63 is formed in an annular shape through which the rotating shaft 11 passes. The lower fixing ring 63 is disposed inside the lower inner wall portion 51d of the shaft sealing chamber 51 along the opening edge of the lower opening 51c, and is fixed to the bottom surface of the shaft sealing chamber 51.

The lower rotating ring 64 is formed in an annular shape along the outer peripheral surface of the rotating shaft 11 . The lower rotating ring 64 is configured to be rotatable together with the rotating shaft 11 and movable in the axial direction with respect to the rotating shaft 11. The lower surface of the lower rotating ring 64 faces the lower fixed ring 63. Further, one end of a spring 65 is fixed to the upper surface of the lower rotating ring 64. The lower rotating ring 64 forms a sliding surface with the lower fixed ring 63.

The spring 65 is, for example, a coil spring arranged around the rotating shaft 11. The spring 65 has an upper rotating ring 62 fixed to its upper end and a lower rotating ring 64 fixed to its lower end. The spring 65 biases the upper rotating ring 62 and the lower rotating ring 64 such that the upper rotating ring 62 is slidable with respect to the upper fixed ring 61 and the lower rotating ring 64 is slidable with respect to the lower fixed ring 63. . The spring 65 is configured, for example, in a shape in which the winding direction from the bottom to the top coincides with the rotation direction of the rotating shaft 11 .

The guide member 53 is attached to the lower inner wall portion 51d of the shaft sealing chamber 51 and directs the lubricant 100 flowing as the rotating shaft 11 rotates to the sliding surface between the upper fixed ring 61 and the upper rotating ring 62. Constructed to be navigable. As shown in FIGS. 3 to 5, the guide member 53 includes a cylindrical portion 81, an opening 82, and a wall portion 83.

The cylindrical portion 81 is formed in a cylindrical shape to cover the circumference of the shaft sealing member 52. Further, the cylindrical portion 81 is configured to be attachable to the lower inner wall portion 51d, and covers the circumference of the shaft sealing member 52 continuously from the lower inner wall portion 51d in the axial direction. Further, the cylindrical portion 81 is formed in a shape that is spaced apart from the ceiling surface of the shaft sealing chamber 51, and covers at least a portion of the upper rotating ring 62 in the axial direction. As a specific example, as shown in FIG. 3, the cylindrical portion 81 covers a portion of the outer circumferential surface of the lower rotating ring 64, the outer circumferential surface of the spring 65, and a portion of the outer circumferential surface of the upper rotating ring 62. The cylindrical portion 81 includes, for example, a first cylindrical portion 81a that covers the circumference of the shaft sealing member 52, and a second cylindrical portion that is integrally provided at the lower end of the first cylindrical portion 81a and is configured to be attachable to the lower inner wall portion 51d. It has a portion 81b.

The first cylindrical portion 81a is formed in a cylindrical shape with a lower end surface abutting the upper surface of the lower inner wall portion 51d and an upper end surface spaced apart from the ceiling surface of the shaft sealing chamber 51. The first cylindrical portion 81a is formed, for example, to have an inner diameter smaller than the outer diameter of the lower inner wall portion 51d, and an outer diameter larger than the inner diameter of the lower inner wall portion 51d.

Further, the inner circumferential surface of the first cylindrical portion 81a faces the outer circumferential surface of the spring 65 with a predetermined gap therebetween. Here, as shown in FIG. 3, the gap formed between the inner circumferential surface of the first cylindrical portion 81a and the outer circumferential surface of the spring 65 is The inflowing lubricant 100 is provided at an interval D that allows a liquid level to be formed in the horizontal direction from the inner circumferential surface of the first cylindrical portion 81a to the outer circumferential surface of the spring 65. Specifically, the interval D is 1.5 mm or less in the radial direction of the first cylindrical portion 81a.

The second cylindrical portion 81b has a cylindrical shape that covers the outer peripheral surface of the lower inner wall portion 51d. The second cylindrical portion 81b has an inner diameter larger than the outer diameter of the first cylindrical portion 81a, and has an inner diameter equivalent to the outer diameter of the lower inner wall portion 51d, for example.

Further, the second cylindrical portion 81b is configured to be removably attached to the lower inner wall portion 51d, and configured to be able to restrict movement of the guide member 53 with respect to the shaft sealing chamber 51. As a specific example, the second cylindrical portion 81b has an engaged portion 81c that engages with the engaging portion 51e of the shaft sealing chamber 51.

The engaged portion 81c is configured to be able to engage with the engaging portion 51e of the shaft sealing chamber 51. The engaged portion 81c is configured to be able to come into contact with the engaging portion 51e in the axial direction and the circumferential direction. The engaged portion 81c is, for example, a notch provided on the inner circumferential surface of the second cylindrical portion 81b and engaged with a protrusion provided in the shaft sealing chamber 51 as an engaging portion 51e. For example, a plurality of engaged parts 81c are provided at equal intervals along the circumferential direction in accordance with the arrangement of the engaging parts 51e. As a specific example, the engaged portions 81c are provided at three locations. The engaged portion 81c restricts movement of the guide member 53 in the axial direction and rotational direction within the shaft sealing chamber 51 by engaging with the engaging portion 51e.

The opening 82 is provided on the lower end side of the cylindrical portion 81 and is an opening that is continuous from the outer circumferential surface of the cylindrical portion 81 to the inner circumferential surface. The opening 82 is configured to allow the lubricant 100 in the shaft sealing chamber 51 to flow into the cylindrical portion 81 . The opening 82 is continuous, for example, from the outer circumferential surface of the second cylindrical portion 81b to the inner circumferential surface of the first cylindrical portion 81a. The opening portion 82 is formed, for example, in the axial direction from the lower end of the second cylindrical portion 81b to a position higher than the height of the lower inner wall portion 51d. In other words, the opening 82 is formed, for example, at a position higher than the upper end of the second cylindrical part 81b and higher than the lower end of the first cylindrical part 81a in the vertical direction. That is, the opening part 82 configures, for example, the first cylindrical part 81a and the second cylindrical part 81b in a shape in which a portion of each of the first cylindrical part 81a and the second cylindrical part 81b is notched in the circumferential direction.

A plurality of openings 82 are provided at equal intervals in the circumferential direction. For example, three openings 82 are provided. Here, the plurality of openings 82 are arranged such that, for example, the engaged portion 81c is located at an intermediate position between the openings 82 adjacent to each other in the circumferential direction.

As shown in FIG. 4, the opening 82 has a first opening end 82a, which is a primary opening end in the rotational direction R of the rotational shaft 11, and a second opening end 82a in the rotational direction R of the rotational shaft 11, as an opening end in the circumferential direction. It has a second open end 82b which is the next open end.

The first open end 82a continues from the outer peripheral surface of the second cylindrical portion 81b to the inner peripheral surface of the first cylindrical portion 81a. As a specific example, the first open end 82a extends from the outer circumferential surface of the second cylindrical portion 81b to the inner circumferential surface of the cylindrical portion 81 with respect to a straight line connecting the axis of the cylindrical portion 81 and the center of the opening 82 in the circumferential direction. Continuous in parallel. Note that since the first open end 82a is integrally provided with a wall portion 83, which will be described later, only a continuous portion of the first open end 82a from the outer peripheral surface of the second cylindrical portion 81b to the wall portion 83 is exposed. are doing.

The second open end 82b forms a predetermined curved shape that is smoothly curved from the outer circumferential surface of the second cylindrical portion 81b to the inner circumferential surface of the first cylindrical portion 81a along the rotational direction R of the rotating shaft 11, and is continuous. do. Specifically, the second open end 82b is formed in the second cylindrical portion 81b, and has an open end surface that continues from the outer peripheral surface of the second cylindrical portion 81b to the first cylindrical portion 81a in a predetermined curved shape, and the first cylindrical portion 81b. The first cylindrical portion 81a includes an open end surface that is formed in a curved shape that is continuous with the open end surface of the second cylindrical portion 81b, and that is smoothly continuous with the inner circumferential surface of the first cylindrical portion 81a. Here, the curved shape of the second open end 82b is configured to be able to guide the lubricant 100 into the inside of the cylindrical portion 81.

Further, the opening 82 has, for example, a protrusion 82c that protrudes outward at the second opening end 82b. The protruding portion 82c is formed in a shape in which a part of the second cylindrical portion 81b forming the second open end 82b is bent outward in the radial direction. Thereby, in this embodiment, the tip of the protrusion 82c and the inner peripheral surface of the second cylindrical part 81b continuous with the protrusion 82c constitute a part of the second open end 82b.

The wall portion 83 is an inner wall that partially closes the opening portion 82 . The wall portion 83 is provided integrally with the first opening end 82a. The wall portion 83 is formed in a shape extending from the first open end 82a toward the secondary side in the rotation direction R of the rotating shaft 11 along the inner circumferential surface of the first cylindrical portion 81a. Further, the inner circumferential surface of the wall portion 83 is continuous with the inner circumferential surface of the first cylindrical portion 81a, and is curved with the same curvature as the inner circumferential surface of the first cylindrical portion 81a. The wall portion 83 is provided on the inner peripheral surface side of the cylindrical portion 81 and faces at least a portion of the radial open end of the opening portion 82 in the radial direction of the cylindrical portion 81 .

Further, the wall portion 83 is, for example, provided integrally with the opening end of the opening portion 82 in the axial direction. Further, the lower end surface of the wall portion 83 is formed, for example, in a shape that is coplanar with the lower end surface of the first cylindrical portion 81a. That is, the lower end surface of the wall portion 83 contacts the upper surface of the lower inner wall portion 51d together with the lower end surface of the first cylindrical portion 81a. In this embodiment, the wall portion 83 faces the radial opening end of the opening portion 82 together with the lower inner wall portion 51d.

The wall portion 83 is preferably formed in a shape in which the circumferential center thereof lies on a plane including the axis of the cylindrical portion 81 and a straight line connecting the axis and the circumferential center of the opening 82 . In other words, the wall portion 83 is formed in such a shape that the end surface on the secondary side in the rotation direction R of the rotating shaft 11 is located on the same plane as the tip surface of the second open end 82b. Furthermore, the wall portion 83 is formed to have a constant width in the axial direction of the cylindrical portion 81 . The wall portion 83 and the lower inner wall portion 51d face each other in the radial direction of the cylindrical portion 81 over the entire radial opening end of the opening portion 82.

The pump device 1 configured in this manner drives the pump 13 by rotating the rotating shaft 11. At this time, the lubricant 100 in the shaft sealing chamber 51 generates a flow as described below.

As shown by the arrow in FIG. 3, the lubricant 100 present on the outside of the guide member 53 passes through the opening 82 of the guide member 53 and flows into the inside of the guide member 53. Further, the lubricant 100 existing inside the guide member 53 generates a swirling flow along the rotational direction of the rotating shaft 11 as the rotating shaft 11 rotates. Here, the lubricant 100 flows inside the guide member 53 along the inner circumferential surface of the first cylindrical portion 81a and the inner circumferential surface of the wall portion 83. Further, the lubricant 100 flowing inside the guide member 53 is prevented from flowing back to the outside of the guide member 53 via the opening 82 by the wall portion 83 and the lower inner wall portion 51d.

4, the lubricant 100 rises through the gap between the spring 65 and the inner wall surface of the guide member 53 by forming a swirl flow inside the guide member 53, and Move to the top side. A portion of the lubricant 100 that has moved toward the upper end of the guide member 53 reaches the sliding surface between the upper fixed ring 61 and the upper rotating ring 62, and lubricates the sliding surface. Further, the other portion of the lubricant 100 that has moved toward the upper end of the guide member 53 flows out to the outside of the guide member 53 through the gap between the upper end of the guide member 53 and the ceiling surface of the shaft sealing chamber 51. In this way, the lubricant 100 in the shaft sealing chamber 51 forms a flow that circulates inside and outside the guide member 53 as the rotating shaft 11 rotates.

In the pump device 1 configured in this way, by arranging the guide member 53 around the rotating shaft 11 in the shaft sealing chamber 51, the lubricant 100 existing inside the guide member 53 is removed as the rotating shaft 11 rotates. Guide it to the upper end. Here, by providing the wall portion 83 on the guide member 53, the pump device 1 can suppress the flow of the lubricant 100 returning from the inside of the guide member 53 to the outside through the opening 82. Thereby, the pump device 1 can maintain a sufficient amount of the lubricant 100 inside the guide member 53, and can stably form a rising flow of the lubricant 100 inside the guide member 53. can. Thereby, the pump device 1 can stably supply the lubricant 100 to the sliding surface between the upper fixed ring 61 and the upper rotating ring 62, and can cool and lubricate the sliding surface.

Further, the wall portion 83 is formed in a shape in which the circumferential center thereof is located on a plane including the axis of the cylindrical portion 81 and a straight line connecting the axis and the circumferential center of the opening portion 82 . As a result, the pump device 1 has a configuration in which the wall portion 83 faces the radial opening end of the opening portion 82 over the entire circumferential direction of the cylindrical portion 81, and the lubricant 100 flows back to the outside of the guide member 53. The effect of suppressing can be enhanced.

In addition, the pump device 1 allows the lubricant 100 to flow through the gap between the spring 65 and the inner wall surface of the guide member 53 by making the winding direction of the spring 65 from the bottom to the top the same as the rotation direction of the rotating shaft 11. can guide the flow in the upward direction.

In addition, the pump device 1 is configured such that the gap between the outer circumferential surface of the spring 65 and the inner circumferential surface of the guide member 53 is 1.5 mm or less in the radial direction. Since the liquid level of the lubricant 100 can be formed, the lubricant 100 can be stably raised in the gap between the spring 65 and the guide member 53.

Further, by providing the engaging portion 51e and the engaged portion 81c in the shaft sealing chamber 51 and the guide member 53, respectively, the movement of the guide member 53 in the axial direction and rotational direction within the shaft sealing chamber 51 can be restricted. can. Thereby, a swirling flow of the lubricant 100 can be stably formed inside the guide member 53.

Further, the guide member 53 engages the engaging portion 51e and the engaged portion 81c by fitting the second cylindrical portion 81b to the lower inner wall portion 51d of the shaft sealing chamber 51 and rotating the second cylindrical portion 81b. I can do it. That is, the guide member 53 can be easily attached to and detached from the shaft sealing chamber 51. Further, by setting the positions where the engaging portion 51e and the engaged portion 81c are provided, positioning of the guide member 53 within the shaft sealing chamber 51 is also easy.

In addition, the guide member 53 has the protrusion 82c, so that the opening area of the opening 82 partially closed by the wall 83 can be expanded. Thereby, the pump device 1 can smoothly cause the lubricant 100 to flow inside the guide member 53.

As described above, according to the pump device 1 and the shaft seal device 14 according to an embodiment of the present invention, lubricant can be stably supplied to the sliding surface located above the liquid level of the lubricant. I can do it.

Note that the present invention is not limited to the above embodiments. For example, in the example described above, the guide member 53 is provided with three openings 82 at equal intervals in the circumferential direction of the cylindrical portion 81, but the present invention is not limited thereto. The arrangement and number of the openings 82 provided in the guide member 53 can be set as appropriate as long as the second opening ends 82b of all the openings 82 are shaped to smoothly continue to the inner peripheral surface of the first cylindrical portion 81a. . The guide member 53 has a shape in which the second open end 82b of the opening 82 is smoothly continuous with the inner circumferential surface of the first cylindrical portion 81a, so that the swirling flow of the lubricant 100 along the inner circumferential surface of the cylindrical portion 81 is improved. can be stably formed.

For example, as shown in FIG. 6, the guide member 53 may have two openings 82, or as shown in FIG. 7, it may have four openings 82. Good too. Note that, as described above, in order for all the openings 82 to have a shape that smoothly continues to the inner peripheral surface of the first cylindrical part 81a, the openings 82 are arranged at two to four locations in the circumferential direction of the cylindrical part 81. A configuration in which either one of the following is provided is suitable. In addition, the guide member 53 has a plurality of openings 82 provided at equal intervals in the circumferential direction of the cylindrical portion 81, so that the second opening end 82b of each opening 82 is placed as close to the inner peripheral surface of the first cylindrical portion 81a as possible. It can be made to continue smoothly, resulting in a more suitable configuration.

Further, in the above-described example, the shaft sealing chamber 51 is configured by the lower surface of the motor casing 21 and the upper surface of the casing cover 43, but the present invention is not limited thereto. The shaft sealing chamber 51 is constituted by two upper and lower shaft sealing objects through which the rotating shaft 11 passes, and the configuration used as the shaft sealing objects can be set as appropriate.

Note that the shaft sealing device 14 described above can also be applied to machines other than the pump device 1. That is, the shaft sealing device 14 is a shaft sealing member in which the rotating shaft 11 is provided along the direction of gravity, and a sliding surface is formed at a position higher than the liquid level 100a of the lubricant 100 in the shaft sealing chamber 51. Any configuration having 52 can be applied.

Note that the present invention is not limited to the above-described embodiments, and can be variously modified at the implementation stage without departing from the gist thereof. Moreover, each embodiment may be implemented in combination as appropriate, and in that case, the combined effect can be obtained. Furthermore, the embodiments described above include various inventions, and various inventions can be extracted by combinations selected from the plurality of constituent features disclosed. For example, if a problem can be solved and an effect can be obtained even if some constituent features are deleted from all the constituent features shown in the embodiment, the configuration from which these constituent features are deleted can be extracted as an invention.
Below, descriptions equivalent to the invention stated in the original claims of the present application will be added.
[1] A rotation axis provided along the direction of gravity,
a motor provided above the rotating shaft and rotating the rotating shaft;
a pump that is provided below the rotating shaft, has a pump casing, and is driven by rotation of the rotating shaft;
a shaft sealing chamber provided between the motor and the pump, formed by at least the pump casing, and through which the rotating shaft passes;
A fixed ring disposed inside the shaft sealing chamber and above the shaft sealing chamber, a rotating ring sliding on the fixed ring, and a spring urging the rotating ring toward the fixed ring. a shaft sealing member having;
a lubricant in an amount that forms a liquid level below the fixed ring in the shaft sealing chamber;
a cylindrical portion whose inner peripheral surface forms a gap with the spring and whose upper end is spaced from the ceiling surface of the shaft sealing chamber and covers the periphery of the spring and at least a portion of the rotating ring; a lower end side of the cylindrical portion; and an opening provided integrally with the opening end on the inner peripheral surface side of the cylindrical portion and on the primary side in the rotational direction of the rotation shaft among the opening ends of the opening, and a guide member having a wall portion facing at least a portion of the opening portion in a radial direction of the portion;
A pump device comprising:
[2] The wall portion is formed in a shape in which a circumferential center thereof is located on a plane including an axis of the cylindrical portion and a straight line connecting the axis and the circumferential center of the opening.[1] Pump device described in.
[3] The pump device according to [1] or [2], wherein the winding direction of the spring from below to above is the same as the rotation direction of the rotating shaft.
[4] The pump device according to any one of [1] to [3], wherein the gap is 1.5 mm or less in the radial direction.
[5] The shaft sealing chamber further includes an annular lower inner wall provided on the bottom surface and an engaging portion provided on the outer peripheral surface of the lower inner wall,
The guide member includes a first cylindrical portion disposed at the upper end of the lower inner wall portion, and an engaged member that is integrally provided at the lower end of the first cylindrical portion and engages with the engaging portion on the inner peripheral surface. a second cylindrical portion having a section;
The pump device according to any one of [1] to [3], wherein the opening is provided from the second cylindrical part to the first cylindrical part.
[6] The pump device according to any one of [1] to [3], wherein the openings are provided at two to four locations along the circumferential direction of the cylindrical portion.
[7] A shaft-sealed chamber provided along the direction of gravity and penetrated by a rotating shaft;
A fixed ring disposed inside the shaft sealing chamber and above the shaft sealing chamber, a rotating ring sliding on the fixed ring, and a spring urging the rotating ring toward the fixed ring. a shaft sealing member having;
a lubricant in an amount that forms a liquid level below the fixed ring in the shaft sealing chamber;
a cylindrical portion whose inner peripheral surface forms a gap with the spring and whose upper end is spaced from the ceiling surface of the shaft sealing chamber and covers the periphery of the spring and at least a portion of the rotating ring; a lower end side of the cylindrical portion; and an opening provided integrally with the opening end on the inner peripheral surface side of the cylindrical portion and on the primary side in the rotational direction of the rotation shaft among the opening ends of the opening, and a guide member having a wall portion facing at least a portion of the opening portion in a radial direction of the portion;
A shaft sealing device comprising:

DESCRIPTION OF SYMBOLS 1... Pump device, 11... Rotating shaft, 12... Motor, 13... Pump, 14... Shaft sealing device, 21... Motor casing, 31... Impeller, 32... Pump casing, 33... Discharge flange, 34... Strainer, 41... No. 1 casing, 41a...Suction port, 41b...Leg part, 42...Second casing, 42a...Accommodating part, 42b...Discharge port, 42c...Seal part, 43...Casing cover, 43a...Opening part, 43b...Seal part, 43c ...Cap hole, 43d...Cap, 43e...Seal part, 51...Shaft sealing chamber, 51a...Upper opening, 51b...Upper inner wall, 51c...Lower opening, 51d...Lower inner wall, 51e...Engaging part , 52... Shaft sealing member, 53... Guide member, 61... Upper fixed ring, 62... Upper rotating ring, 63... Lower fixed ring, 64... Lower rotating ring, 65... Spring, 81... Cylindrical part, 81a... First cylinder part, 81b...second cylindrical part, 81c...engaged part, 82...opening part, 82a...first open end, 82b...second open end, 82c...projection part, 83...wall part, 100...lubricant, 100a...liquid level, 200...first fastening member, 300...second fastening member.

Claims (6)

A rotation axis provided along the direction of gravity,
a motor provided above the rotating shaft and rotating the rotating shaft;
a pump that is provided below the rotating shaft, has a pump casing, and is driven by rotation of the rotating shaft;
a shaft sealing chamber provided between the motor and the pump, formed by at least the pump casing, and through which the rotating shaft passes;
A fixed ring disposed inside the shaft sealing chamber and above the shaft sealing chamber, a rotating ring sliding on the fixed ring, and a spring urging the rotating ring toward the fixed ring. a shaft sealing member having;
a lubricant in an amount that forms a liquid level below the fixed ring in the shaft sealing chamber;
a cylindrical portion whose inner peripheral surface forms a gap with the spring and whose upper end is spaced from the ceiling surface of the shaft sealing chamber and covers the periphery of the spring and at least a portion of the rotating ring; a lower end side of the cylindrical portion; and an opening provided integrally with the opening end on the inner peripheral surface side of the cylindrical portion and on the primary side in the rotational direction of the rotation shaft among the opening ends of the opening, and a guide member having a wall portion facing at least a portion of the opening portion in a radial direction of the portion;
Equipped with
In the pump device , the winding direction of the spring from the bottom to the top is the same as the rotation direction of the rotation shaft . The wall portion is formed in a shape in which a circumferential center thereof is located on a plane including an axis of the cylindrical portion and a straight line connecting the axis and the circumferential center of the opening. pump equipment. The pump device according to claim 1 or 2 , wherein the gap is 1.5 mm or less in the radial direction. The shaft sealing chamber further includes an annular lower inner wall provided on the bottom surface and an engaging portion provided on the outer peripheral surface of the lower inner wall,
The guide member includes a first cylindrical portion disposed at the upper end of the lower inner wall portion, and an engaged member that is integrally provided at the lower end of the first cylindrical portion and engages with the engaging portion on the inner peripheral surface. a second cylindrical portion having a section;
The pump device according to claim 1 or 2 , wherein the opening is provided from the second cylindrical part to the first cylindrical part. 3. The pump device according to claim 1 , wherein the openings are provided at two to four locations along the circumferential direction of the cylindrical portion. a shaft sealed chamber provided along the direction of gravity and penetrated by a rotating shaft;
A fixed ring disposed inside the shaft sealing chamber and above the shaft sealing chamber, a rotating ring sliding on the fixed ring, and a spring urging the rotating ring toward the fixed ring. a shaft sealing member having;
a lubricant in an amount that forms a liquid level below the fixed ring in the shaft sealing chamber;
a cylindrical portion whose inner peripheral surface forms a gap with the spring and whose upper end is spaced from the ceiling surface of the shaft sealing chamber and covers the periphery of the spring and at least a portion of the rotating ring; a lower end side of the cylindrical portion; and an opening provided integrally with the opening end on the inner peripheral surface side of the cylindrical portion and on the primary side in the rotational direction of the rotation shaft among the opening ends of the opening, and a guide member having a wall portion facing at least a portion of the opening portion in a radial direction of the portion;
Equipped with
In the shaft sealing device, the winding direction of the spring from the bottom to the top is the same as the rotation direction of the rotating shaft .